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TLS Online TPP Program

#Question id: 3887

Aptamers are

#SCPH01 Biochemistry

  1. double-stranded RNA products of nuclease action on hairpin RNAs

  2. repeat sequence elements at the ends of transposons.

  3. small RNA molecules selected for tight binding to specific molecular targets.

  4. the RNA primers required for retroviral replication.

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TLS Online TPP Program

#Question id: 10594

#SCPH06 I Botany

Which of the following is not characteristic of ruderal species?
TLS Online TPP Program

#Question id: 9270

#SCPH05 I Biotechnology

In the lowest excited state, the excited chlorophyll has four alternative pathways for disposing of its available energy which of the statement of alternative pathway would be INCORRECT?
TLS Online TPP Program

#Question id: 11800

#SCPH05 I Biotechnology

There are at least three different types of companion cells in the minor veins of mature, exporting leaves. Which of the following statements about these companion cells is CORRECT?

 a.) transfer cells are transport sugars enter the apoplast during the movement of sugars from mesophyll cells to sieve elements. Transfer cells transport sugars from the apoplast to the symplast of the sieve elements and companion cells in the source.

 b.) the numerous mitochondria in companion cells may supply energy as ATP to the sieve elements

 c.) Ordinary companion cells can function in either symplastic or apoplastic short-distance transport in source leaves, depending in part on plasmodesmatal frequencies

 d.) Intermediary cells, by contrast, function in symplastic transport of sugars from mesophyll cells to sieve elements
TLS Online TPP Program

#Question id: 13057

#SCPH28 | Zoology

Precision will be reduced, but yield will be increased
Optimisation of a PCR reaction is often a compromise between the competing demands for precision, efficiency and yield. Although the specific effects may vary, generally, increasing the annealing temperature will increase non-specific primer binding and reduce precision. Increasing the length of the elongation phase will reduce the proportion of incomplete newly-synthesised strands and therefore increase yield. In this case, the potential effect on efficiency is unclear. Increasing the elongation phase would increase the reaction time, but the time taken to ramp down to a lower annealing temperature would be reduced.
How primer concentration leads to decrease in PCR efficiency?
TLS Online TPP Program

#Question id: 687

#SCPH05 I Biotechnology

All of the following are considered “weak” interactions in proteins, except: